Microwave Spectrum of the SO Radical

Abstract

Five microwave transitions of the SO free radical in the gas phase have been measured and assigned. The lines result from electric dipole transitions between rotational levels in the 3Σ— ground state which are strongly perturbed by the interaction of the electron spin. The molecular constants determined from the analysis are B0=0.71791 cm—1, λ=5.276 cm—1, and γ=—0.0052 cm—1. The electric dipole moment has been determined as 1.55 D from the Stark effect. Wavefunctions and intensities are discussed. A combination of microwave and optical data gives Be=0.72072 cm—1 and re=1.48095 Å for the ground state and λ=3.5 cm—1 for the excited B 3Σ— electronic state. The spectrum was studied in a flow system in which SO was generated by the reaction of oxygen atoms with OCS or other materials. The apparatus is described in detail.

A line confusion-limited millimeter survey of Orion KL

“…For 34 SO and S 18 O (μ = 1.535 D) from Tiemann (1974), Tiemann (1982, Lovas et al (1992), Klaus et al (1996), Bogey et al (1982), and Powell & Lide (1964). And for 33 SO (μ = 1.535 D) from Klauss et al (1996), Lovas et al (1992), and Powell & Lide (1964). In the case of SO 2 and 33 SO 2 (μ = 1.633 D), the spectroscopic parameters were taken from Müller et al (2000) and Patel et al (1970).…”

“…Its rotational levels are characterized by the rotational angular momentum quantum number, N, and the total angular momentum 2 Spectroscopic parameters for SO (dipole moment μ = 1.535 D) have been obtained from Clark & DeLucia (1976), Tiemann (1982, Lovas et al (1992), Cazzoli et al (1994), Klaus et al (1996), Bogey et al (1997), Powell &Lide (1964), andMartin-Drumel (2012). For 34 SO and S 18 O (μ = 1.535 D) from Tiemann (1974), Tiemann (1982, Lovas et al (1992), Klaus et al (1996), Bogey et al (1982), and Powell & Lide (1964). And for 33 SO (μ = 1.535 D) from Klauss et al (1996), Lovas et al (1992), and Powell & Lide (1964).…”

Pure Rotational Spectra of SO: Rare Isotopomers in the 80-GHz to 1.1-THz Region

“…On the other hand, quite a lot of experikind of investigation, since oxygen and sulfur provide three mental data have been acquired for the more abundant isotoand four stable isotopes, respectively. The molecule also pomers of SO in the ground electronic state X 3 S 0 (11)(12)(13)(14)(15)(16)(17). provides a good example for the significance of rotational Among them, the works of Bogey et al (16) and Tiemann spectra of rare isotopomers in astrochemistry.…”

A Survey of the SO J K = 1 0 –0 1 Transition toward Massive Star‐forming Regions

“…We calculated the partition function using the expression for the energy levels of SO from Powell & Lide (1964), including energy levels up to $1000 K. Line strengths were taken from Tiemann ( 1974). The resulting column densities range from 0:58 ; 10 14 to 12 ; 10 14 cm À2 and are listed in Table 5.…”